Bed and cylinder printing press



Juiy 3Q, 1935. c. B. COTTRELL, 313

BED AND CYLINDER PRINTING PRESS Filed May 11, 1933 2 Sheets-Sheet 1ATTORNEYS Juiy 30, 1 935. c. B. COTTRELL, an

BED AND CYLINDER PRINTING PRESS Filed May 11, 1933 2 Sheets-Sheet 2INVENTOR. g: ,,,,%WZ

ATTORNEYS Patented July 30, 1935 UNITwfsmE BED momma PRINTING-'PRESS-Calvert. B. OottreIl, 3d,. Westeflm. R.-'I., assignor to C. .13.Cott'rell ,&1. Sons Company,

7 'R'.l" a; corporation of'Delaware' Westerly,

Application May 1-1, 1933, Serial No. srono'o J I6, claims. (01;101-283) invention is. directed, broadly, to novel' means. for. bringingthe bed and cylinder into printing. coaction. providing: a sheet hasb'een fed to-ithe press properly registered, sa-id be'd and cylinderremaining out. of said printingcoac tion'. should a; sheet fail t'o befed to the press.-

.My'invention more particularly consists in elec'--' trically controlledmechanical means for raising and-lowering the impression cylinder;said-mechanical means comprising a toggle lever, adif ferentialgear foropening and closing the toggle lever to. cause the. raising and loweringrespec tilvely oflthe impression cylinder, and an electric brake? forthe differential gear, said brake being controlled by the bed as itreaches -the limit of* its printing stroke. and. by a light responsivede-' vice, as a photoelectric unit, as the bed-reaches the limit ofits-non-printing stroke.

Izhave chosen to illustrate my invention in" connection with the bedandcylinder printing press shown in fulllines inthe positions they assumeas the-registered sheet is about to be taken from the feeder bythei'orin bed grippers onthe print-- ing stroke of the bed, andin dottedlines inthepositions they assume as the bed reaches the end ofits-printing stroke; 7

.Eig, 2 represents a detail horizontal section taken in. the plane ofthe line II-'I-I- of Fig. 1

looking in the direction of the arrows;' and I -E'1g; Bfisa completewiring diagramof the em-- bodiment represented in Figs. 1 and 2'5 The:oscillating impression cylinder is denoted *by I! and itsiset ofgripper-shy 'The-rec'iprocat ing bed is denoted by 3 and its form by 4;"The sheet feeder, denotedby 5,is provided with the usualasheet Step6;said feeder being'located a'tone side'of the impressioncylinder"I-." i

pressi'on. cylinder and todeliver the-sheets at the;

top. ofi the" rotary carrier tothe coactingiendless tape carriers.9-,,I0

- 'I.he. reciprocating form- -b'ed is provided with a set of tumbleractuated grippers! l which op- ':-'ezate.0rrthe:printing stroke ofthebedto-take the sheets from the feeder 5i after they have beenregistered and to transfer the sheets to theimpressioim cylindergrippers'2 at the bottom of the a cylinder, as shown; described andclaimed' i n' mysaid c'open'ding application filed February 2, 1933,Serial No. 654,855;

The several grippers may be operated in any well known orapproved mannerat the proper times, and their operating means-are not shown and Willnot be specifically described herein. 4

vMeansare provided for normally lifting theimpression cylinderaway fromits printing co acti'on'with the form bed said means in the presentinstancecomprisi ng' expansion springs l2;

The-electrically controlled" mechanically oper ated means forcausing-the bringing of the bedand cylinder into and out or coaction isconstructed; arranged; and operated asfollows:

A toggle lever has its upper arms l3 pivoted at M- to: the frame and hasits lower a-rms 55, carried by a rock shaft I6 mounted in the crossheadsll of the cylinder li fting' bars IS; The- I shaft I5 is providedwith a depending arm IQ which: is connected by arod 213' me crank 2! onthe differential gear'shaft 22. The difierential, gear isconstantlydriven from" the" drive shaft 23;;

The shaft 2"4- of the-differential gear -'is pro--- vided with aclutch-mechanism drum Zirconne'cted' to thearmat'ure 2 ofthe electricbrake 282 This electric brake" 28 isconnected through a circuitmaker andbreaker 2-9 by the circuit Wires 35,3 4,34 -The circuit maker andbreaker 29 1s in the form of aq'io'rm'a'lly open switch having' its. arm32 arranged in position tobe moved bya. lug- 33 on the-bed 3 as thebedreaches the a limit of-its printing stroke, to close the circuitthrough the wires- 39, 3 34'- for energizing the electric brake 2 8.'I'hewires- 361"; 3'! arealso connected through a circuit maker andbreaker37- to" a circuit wire"3 l-leading"to a source ofel'ec: tr-iccurrent? supply not shown herein; The oil"- cuitmaker and breaker IFFisa normally open switch, 5 which" circuit is open when the toggle V leveris closedandi's closedwhen'the toggle'lever' The delivery which islocated at theothersid'e*- ot'the: impression cylinder includes; in thepres; ent. instance, a rotary sheet carrier- I, provided is open. Theelectric brake'2 8 isconnected directly to a source'ofelectric currentsupply, not shown herein} through the circuit wire 35. The electricbrakeZ8 is also under the control of a light responsive device such, forinstance;- asa photoelectric unit which' i's inturn controlled bytlieregistry ofl the sheetcm the sheetfeeder 5; as is clearly shown in mycopending application filed December 17, 1932, SeriaI No:fi l lfllfnowLetters Patent: 1395 1 301) datedTQMarch 20, 1934 i This photoelectricunit is connected i open the switch 36 and the circuit through the,

through the circuit line 46 to theside guide 41 of the sheet registeringdevice, the operation of which is fully explained in my said LettersPatent 1,951,901. This photoelectric unit comprises, generally, thefollowing elements:

The photoelectric tube 38 is electrically connected to the photoelectricrelay 39 of any well known or approved form. This photoelectric tube 38is positioned beneath the feed table 5 in the path of a beam of lightprojected from the lamp 4!]. This relay 39 is electrically connected tothe electric brake 28 through thecircuit wires 4|, 42. The circuit wires4 I, 42 are also connected through a circuit maker and breaker 36 to anormally open switch, which circuit is closed when the toggle lever isclosed, and open when the toggle lever is open. This relay 39 is alsoelectrical- 1y connected to a source of electric current supply, notshown herein, through the circuit Wires 44. 45.

In operation: As the bed 3 reaches the limitv of its non-printingmovement and presupposing that a sheet has been fed and registered sothat it is in position to be taken by the grippers H of the bed, theregistry of the sheet will out off the beam of light from the lamp 40 ofthe photoelectric unit, thereby closing the contactor switch 48 andcompleting a circuit through the electric brake 28, thus causing thebrake to hold the differential shaft 24 against rotary movement. Thiswill permit the constantly driven shaft 23 to rotate the differentialshaft 22 to move the toggle lever I3, I5 in the direction to lower theimpression cylinder I into printing position. As the toggle lever movesin this direction it will 28 as the differential shaft is rotatedone-half arevolution, the freeing of the differential shaft 24 renderingthe drive between the shafts 23 and 22 ineffective, Also as the togglelever l3, l5 movesin the said direction it will close the switch 31.

As the bed reaches the limit of its printing movement its lug 33 willengage the switch arm 32, thus closing the circuit throughthe circuitmaker and breaker 29 andthe circuit wires 39, 3|, thereby energizing thebrake and causing it to again hold the differential shaft24 stationary.This will permit the drive shaft 23, to rotate the differential shaft 22to break the toggle lever, thus permitting the expansion springs [2 toraise the impression cylinder out of its printing position. As thetoggle lever l3, I5 is opened it will again open the switch 31, thusdeenergizing the electric brake 28, thereby releasing the differentialshaft 24 and rendering ineffective the connection between the driveshaft 23 and crank shaft 22.

It will be understood that if no sheet is fed to the form bed grippersIf on the printing stroke of the bed the electric brake 28 will remaindeenergized, thus allowing the springs 12 to hold the impressioncylinder I in its raised position out of printing coaction with the formbed.

It is evident that various changes may be resorted to in theconstruction, form and arrangement of the several parts withoutdeparting from the spirit and scope of my invention, and

hence I do not intend to be limited to the particular embodiment hereinshown and described,

- printing stroke, said brake being operated by the but What I claimis; 1. In a bed and cylinder printing press, an im- .pression cylinder,a reciprocating form bed, a

sheet feed controlled photoelectric unit, means normally separating thebed and cylinder, and means for bringing the bed and cylinder into andout of printing coaction, said means including a lever, a differentialgear for operating it and an electric brake for the differential gear,controlled by the bed and said photoelectric unit.

2. In a bed and cylinder printing press, an impression cylinder, areciprocating form bed, a sheet feed controlled photoelectric unit,means normally lifting the cylinder from the bed, and means for bringingthe cylinder into and out of printing coaction with the bed, said meansincluding a lever, a differential gear for operating it and an electricbrake for the differential gear, controlled by the bed and saidphotoelectric unit.

3. In a bed and cylinder printing press, an impression cylinder, areciprocating form bed, a sheet feed controlled photoelectric unit,means normally separating the bed and cylinder, and means for bringingthe bed and cylinder into 'and out of printing coaction, said meansincluding a lever, a differential gear for operating it, an electricbrake for the differential gear and a circuit maker and breaker for thebrake, operated by the bed at theend of its printing stroke, said brakebeing operated by the photoelectric unit at the end of the non-printingstroke of the bed.

4. In a bed and cylinder printing press, an impression cylinder, areciprocating form bed, a sheet feed controlled photoelectric unit,means normally lifting the cylinder from the bed, and

means for bringing the cylinder into and out of printing coaction withthe bed, said means including a lever, a differential gear for operatingit, an electric brake for the differential gear and a circuit maker andbreaker for the brake, operated by the bed at the end of its printingstroke,

said brake being operated by the photoelectric unit at the end of thenon-printing stroke of the bed.

5. In a bed and cylinder printing press, an im-- pression cylinder, areciprocating form bed, a sheet feed controlled photoelectric unit,means normally separating the bed and cylinder, and means forbringingthe bed and cylinder into and out of printing coaction, said meansincluding a,

toggle lever, a differential gear for opening and closing it and anelectric brake for the difierential gear, controlled by the bed and saidphotoelectric unit. 7

6. In a bed and cylinder printing press, an impression cylinder, areciprocating form bed, a sheet feed controlled photoelectric unit,means normally lifting the cylinder from the bedaand means for bringingthe cylinder into and out of printing coaction with the bed, said meansincluding a toggle lever, 'a differential gear for opening'and closingit and an electric brake for the differential gear, controlled by thebed. and sa1d photoelectric unit.

7. In a bed and cylinder printing press, an impression cylinder, areciprocating form bed, a sheet feed controlled photoelectric unit,means normally separating the bed and cylinder, and means for bringingthe bed and cylinderinto and out'of printing coaction, said meansincluding a toggle lever, a differential gear for opening and closingit, an electric brake for the differential gear and a circuit maker andbreaker for the brake, operated by the bed at the end of itsphotoelectric unit at the end of the non-printing stroke. of the bed.

8. In a bed and cylinder printing press, an

impression cylinder, a reciprocating form bed, a sheet feed controlledphotoelectric unit, means normally lifting the cylinder from the bed,and means for bringing the cylinder into and out of printing coactionwith the bed, said means including a toggle lever, a diiferential gearfor opening and closing it, an electric brake for the differential gearand a circuit maker and breaker for the brake, operated by the bed atthe end of its printing stroke, said brake being operated by thephotoelectric unit at the end of the nonprinting stroke of the bed.

9. In a bed and cylinder printing press, an impression cylinder, areciprocating form bed, a sheet feed controlled photoelectric unit,means normally separating the bed and cylinder, and means for bringingthe bed and. cylinder into and out of printing coaction, said meansincluding a lever, a differential gear for operating it and an electricbrake for the differential gear, controlled by the bed and saidphotoelectric unit, said brake being also under the control of the saidlever.

10. In a bed and cylinder printing press, an impression cylinder, areciprocating form bed, a sheet feed controlled photoelectric unit,means normally lifting the cylinder from the bed, and means for bringingthe cylinder into and out of printing coaction with the bed, said meansincluding a lever, a difierential gear for operating it and an electricbrake for the diiferential gear, controlled by the bed and saidphotoelectric unit, said brake being also under the control of the saidlever.

11. In a bed and cylinder printing press, an impression cylindenareciprocating form bed, a sheet feed controlled photoelectric unit,means normally separating the bed and cylinder, and means for bringingthe bed and cylinder into and out of printing coaction, said meansincluding a lever, a differential gear for operating it, an electricbrake for the differential gear and a circuit maker and breaker for thebrake, operated by the bed at the end of its printing stroke, said brakebeing operated by the photoelectric unit at the end of the non-printingstroke of the bed, said brake being also under the control of the saidlever.

12. In a bed and cylinder printing press, an impression cylinder, areciprocating form bed, a sheet feed controlled photoelectric unit,means normally lifting the cylinder from the bed, and means for bringingthe cylinder into and out of printing coaction with the bed, said meansincluding a lever, a differential gear for operating it, an electricbrake for the diiferential gear and a circuit maker and breaker for thebrake, op-

erated by the bed at the end of its printing stroke, said brake beingoperated by the photoelectric unit at the end of the non-printing strokeof the bed, said brake being also under the control of the said lever.

13. In a bed and cylinder printing press, an impression cylinder, a.reciprocating form bed, a sheet feed controlled photoelectric unit,means normally separating the bed and cylinder, and means for bringingthe bed and cylinder into and out'of printing coaction, said meansincluding a. toggle lever, a diiferential gear for opening and closingit and an electric brake for the differential gear, controlled by thebed and said photoelectric unit, said brake being also under the controlof the said toggle lever.

14. In a bed and cylinder printing press, an impression cylinder, areciprocating form bed, a

sheet feed controlled photoelectric unit, means normally lifting thecylinder from the bed, and means for bringing the cylinder into and outof printing coaction with the bed, said means including a toggle lever,a differential gear for opening and closing it and an electric brake forthe differential gear, controlled by the bed and said photoelectricunit, said brake being also under the control of the said toggle lever.

15. In a bed and cylinder printing press, an impression cylinder, areciprocating form bed, a

sheet feed controlled photoelectric unit, means normally separating thebed and cylinder, and means for bringing the bed and cylinder into andout of printing coaction, said means including a toggle lever, adifferential gear for opening and closing it, an electric brake for thedifferential gear and a circuit maker and breaker for the v brake,operated by the bed at the end of its printing stroke, said brake beingoperated by the photoelectric unit at the end of the non-printing strokeof the bed, said brake being also under the control of the said togglelever.

16. In a bed and cylinder printing press, an impression cylinder, areciprocating form bed, a sheet feed controlled photoelectric unit,means normally lifting the cylinder from the bed, and means for bringingthe cylinder into and out of printing coaction with the bed, said meansincluding a toggle lever, a differential gear for opening and closingit, an electric brake for the differential gear and a circuit maker andbreaker for the brake, operated by the bed at the end of its printingstroke, said brake being operated by the photoelectric unit at the endof the nonprinting stroke of the bed, said brake being also under thecontrol of the said toggle lever.

CALVERT B. COTTRELL, 3RD.

